WatchOS 2: “Cannot Install Watch App” “Error Launching 'TestApp WatchKit App Extension'”

Question

I am getting a AlertView popup error on iOS every time I try to install a watchOS 2 app in Xcode 7 beta 4:

Cannot Install Watch App<

Answer 1

I had this same issue. This happens due to issue while installing app on watchOS.

Below are some fix for this :

1. Clean Xcode (try cmd+shift+K and cmd+shift+option+K - Clean Build Folder).

2. Quit Xcode and re-build your app.

3. Delete app and reinstall it.

Solution 1 worked in my case.